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Commit 907cd880 authored by Kuninori Morimoto's avatar Kuninori Morimoto Committed by Mark Brown
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ASoC: ak4613: add hw_constraint rule for Sampling Rate 



Current ak4613 accepts all range of Sampling Rate, but it depends on
inputed master clock. This patch adds hw constraint rule for it.

Signed-off-by: default avatarKuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: default avatarHiroyuki Yokoyama <hiroyuki.yokoyama.vx@renesas.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent a83ac486

sound/soc/codecs/ak4613.c

+61 −0
Original line number Diff line number Diff line
@@ -94,6 +94,8 @@ struct ak4613_interface { 
struct ak4613_priv {

	struct mutex lock;

	const struct ak4613_interface *iface;

	struct snd_pcm_hw_constraint_list constraint;

	unsigned int sysclk;



	unsigned int fmt;

	u8 oc;
@@ -252,6 +254,50 @@ static void ak4613_dai_shutdown(struct snd_pcm_substream *substream, 
	mutex_unlock(&priv->lock);

}



static void ak4613_hw_constraints(struct ak4613_priv *priv,

				  struct snd_pcm_runtime *runtime)

{

	static const unsigned int ak4613_rates[] = {

		 32000,

		 44100,

		 48000,

		 64000,

		 88200,

		 96000,

		176400,

		192000,

	};

	struct snd_pcm_hw_constraint_list *constraint = &priv->constraint;

	unsigned int fs;

	int i;



	constraint->list	= ak4613_rates;

	constraint->mask	= 0;

	constraint->count	= 0;



	/*

	 * Slave Mode

	 *	Normal: [32kHz, 48kHz] : 256fs,384fs or 512fs

	 *	Double: [64kHz, 96kHz] : 256fs

	 *	Quad  : [128kHz,192kHz]: 128fs

	 *

	 * Master mode

	 *	Normal: [32kHz, 48kHz] : 256fs or 512fs

	 *	Double: [64kHz, 96kHz] : 256fs

	 *	Quad  : [128kHz,192kHz]: 128fs

	*/

	for (i = 0; i < ARRAY_SIZE(ak4613_rates); i++) {

		/* minimum fs on each range */

		fs = (ak4613_rates[i] <= 96000) ? 256 : 128;



		if (priv->sysclk >= ak4613_rates[i] * fs)

			constraint->count = i + 1;

	}



	snd_pcm_hw_constraint_list(runtime, 0,

				SNDRV_PCM_HW_PARAM_RATE, constraint);

}



static int ak4613_dai_startup(struct snd_pcm_substream *substream,

			      struct snd_soc_dai *dai)

{
@@ -260,6 +306,19 @@ static int ak4613_dai_startup(struct snd_pcm_substream *substream, 


	priv->cnt++;



	ak4613_hw_constraints(priv, substream->runtime);



	return 0;

}



static int ak4613_dai_set_sysclk(struct snd_soc_dai *codec_dai,

				 int clk_id, unsigned int freq, int dir)

{

	struct snd_soc_codec *codec = codec_dai->codec;

	struct ak4613_priv *priv = snd_soc_codec_get_drvdata(codec);



	priv->sysclk = freq;



	return 0;

}
@@ -411,6 +470,7 @@ static int ak4613_set_bias_level(struct snd_soc_codec *codec, 
static const struct snd_soc_dai_ops ak4613_dai_ops = {

	.startup	= ak4613_dai_startup,

	.shutdown	= ak4613_dai_shutdown,

	.set_sysclk	= ak4613_dai_set_sysclk,

	.set_fmt	= ak4613_dai_set_fmt,

	.hw_params	= ak4613_dai_hw_params,

};
@@ -529,6 +589,7 @@ static int ak4613_i2c_probe(struct i2c_client *i2c, 


	priv->iface		= NULL;

	priv->cnt		= 0;

	priv->sysclk		= 0;



	mutex_init(&priv->lock);